Cluch for Vespa 50S with 90 cm2 cylinder what clutch discs recommend me

Schaltroller / Classic Motoscooters Vespa Smallframe
1

I have a 50s vespa 1979
I intend to replace clutch, got 90 cm2 cylinder
What clutch discs recommend me, the source spends himself quickly.
I look forward to your response
Thank you